The station reported that Oakland firefighters responded to the three-alarm fire at the warehouse about 11:30 p.m. local time Friday and were still on the scene Saturday morning.

Firefighters told the station there were about 50 people inside the two-story building in Oakland's Fruitvale district at the time.

Police told the station the building houses a group of artists and their studios.

The warehouse party featured musician Golden Donna’s 100% Silk West Coast tour.

Most of those who were killed were found on the second floor, the East Bay Times reported.

Fire Chief Teresa Deloach-Reed said firefighters saw no evidence that smoke detectors were activated during the fire and there was no sprinkler system in the building, according to the paper.

“We still have to do a more thorough search of the building and we don’t know the potential number of other victims,” Deloach-Reed said, according to the paper.

The blaze is already being called one of the deadliest single-structure fires in Oakland’s history, if not the deadliest, the East Bay Times reported.

“This is a true loss for the city, for the firefighters who responded, and the people who lost family and friend. It’s just tragic, a real tragedy,” the fire chief said.

Friends and family of party-goers were on social media early Saturday looking to confirm the whereabouts of loved ones, according to the paper.

Some people have posted images and messages on Facebook of people they believe are missing, while other have posted that they had escaped safely, the paper reported.

“It was too hot, too much smoke, I had to get out of there,” Bob Mule, a photographer who lives at the building, told the paper. “I literally felt my skin peeling and my lungs being suffocated by smoke. I couldn’t get the fire extinguisher to work.”

Mule suffered minor burns. He told the paper he saw another person jump from a second floor window.

A police spokesman referred an Associated Press reporter to the coroner's office. The office said the coroners were also at the scene Saturday morning and unavailable for comment.